Blue Hole

Verified2026-09-24 checkedCavernWall

A vertical limestone shaft opening at 18 m that lets you out through a window in the outer wall at about 40.

Depth: 18–40 m59–131 ft
Difficulty: Advanced
Entry: Boat
Typical current: Moderate
Coordinates: 13°14.550′N 144°37.452′E
Activities: Scuba · Technical

A natural chimney through the limestone shelf off Orote Point. The top is a square opening at about 18 m; the shaft drops straight down and opens through a window in the outer wall at around 40 m, where the reef falls away into blue. The usual dive drops in from the top, exits through the window and works back up the wall outside. It is deeper than it looks from above, the exit is the deepest part of the plan, and the wall beyond it is where the current and the sharks are. Swell wrapping around the point closes the site often enough that a booked day is not a guaranteed one.

Twenty minutes by boat from Apra Harbor or Agana; cancelled when swell wraps around Orote Point.

Best season

ExcellentDec–Apr
GoodMay–Jul
GoodOct–Nov
FairAug–Sep

Before you get in

A cavern — inside the daylight zone, but still with a ceiling, and with stretches where you cannot simply go up.
Past 30 m, where no-stop time and gas both go quickly and nitrogen narcosis starts to show.
A wall. There is no bottom in sight to judge against, so depth is kept by the gauge alone — and it is easy to end up deeper than intended.

Taken from this site’s recorded depth, type and current, and nothing else. An empty list is not a safe site — the sea on the day, the local geography and the boat traffic are not in it. The briefing on the spot comes first.

Conditions

Water temperature: 29.3°C85°F
Wave height: 1.7 m5 ft
Air temperature: 26.1°C79°F
Wind speed: 12.2 km/h7.6 mph

Updated 2026-10-07 16:15 UTC · Source: Open-Meteo

Weather data by Open-Meteo.com (CC BY 4.0)

Conditions are reported for information only. Assess the site yourself and follow your guide and your training.

No live conditions for this site yet.

We only show numbers we can attribute to a source.

Sea state and tide

On a date

Tide · 10/8

Low11:070.24 m
High17:420.86 m
Low23:550.39 m

Forecast heights against mean sea level. Real tides in a bay, a harbour or over a flat can differ — check an official tide table before you get in.

Pick a day to see its tide

Only wave height and wind are scored, because those are what close a boat ramp or a shore entry. Water temperature is reported and never scored: 12°C is an ordinary dive in a drysuit and punishing in a 3 mm, and a number that cannot see your suit has no business marking it down. Stars do not decide whether you get in — you and your guide do, on the day.

Weather data by Open-Meteo.com (CC BY 4.0)

Marine life you may see

Whitetip reef sharkTriaenodon obesusCommon
Bigeye trevallyCaranx sexfasciatusCommon
Napoleon wrasseCheilinus undulatusSeasonal
Grey reef sharkCarcharhinus amblyrhynchosSeasonal
Spotted eagle rayAetobatus narinariSeasonal
Staghorn coralAcropora spp.Common
TrumpetfishAulostomus chinensisCommon
Moorish idolZanclus cornutusCommon
Titan triggerfishBalistoides viridescensCommon

From divers

What people who were in the water reported. Not a forecast, and not a judgement about whether the site is safe to dive.

No recent reports from divers. If you dived here in the last two weeks, you can say how it was.

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